There are quite a few reservations around the Puget Sound Area. There
must be a complete list somewhere. Try the State of Washington's site on
the web.

Here are some I know of: Swinomish near LaConner; Lummi near
Bellingham; Skokomish near Potlatch; Nisqually between Tacoma and
Olympia. Try looking at a WA state map.

My husband tells me his late wife's mother was
Salish-Kootnai (Montana) and was sent to the Government's Chemawa
Indian School in Salem, Oregon, as were Indian children from all over
the Northwest. You might find records there.